Execute a task after waking up from Suspend/sleep

Ask Fedora
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1

I want to execute the following task after waking up from Suspend/sleep, it shows the duration of suspend in a notify-send desktop notification.

mapfile -t UnixDate < <(journalctl -o short-iso --since "24 hours ago" | grep systemd-sleep | tail -n 2 | awk '{print $1}' | xargs -L 1 date +%s -d)
if (("${#UnixDate[@]}" == 2)); then
	Duration="$(python -c "import datetime; time=(${UnixDate[1]} - ${UnixDate[0]})/3600; print(str(datetime.timedelta(hours=time)))")"
	notify-send \
		--app-name="Suspend" \
		--icon=face-smile \
		--urgency=normal \
		--expire-time=3000 \
		--hint int:transient:1 \
		"Slept" "${Duration}"
fi

What I tried?

$ pwd
/usr/lib/systemd/system-sleep

$ ls -la
total 4.0K
755 -rwxr-xr-x. 1 root root 574 2024-05-19 09:24 Suspend_notification.sh

$\cat Suspend_notification.sh  
#!/usr/bin/env bash

if [ "${1}" == "post" ]; then
        journalctl -o short-iso --since "24 hours ago" | grep systemd-sleep | tail -n 2
        mapfile -t UnixDate < <(journalctl -o short-iso --since "24 hours ago" | grep systemd-sleep | tail -n 2 | awk '{print $1}' | xargs -L 1 date +%s -d)
        if (("${#UnixDate[@]}" == 2)); then
                Duration="$(python -c "import datetime; time=(${UnixDate[1]} - ${UnixDate[0]})/3600; print(str(datetime.timedelta(hours=time)))")"
                notify-send \
                        --app-name="Suspend" \
                        --icon=face-smile \
                        --urgency=critical \
                        "Slept" "${Duration}"
        fi
fi